package org.smart4j.chapter1.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

/**
 * description:
 * Created by gy on 2017/4/19.
 */
public final class PropsUtil {

    private static final Logger LOGGER = LoggerFactory.getLogger(PropsUtil.class);

    /**
     * 加载属性文件
     *
     * @param fileName
     * @return
     */
    public static Properties loadProps(String fileName) {

        Properties props = null;
        InputStream is = null;

        try {

            is = Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName);

            if (null == is) {
                throw new FileNotFoundException(fileName + "file is not found");
            }

            props = new Properties();
            props.load(is);

        } catch (IOException e) {

            LOGGER.error("load properties file failure", e);

        } finally {

            if (null != is) {
                try {
                    is.close();
                } catch (IOException e) {
                    LOGGER.error("close input stream failure", e);
                }
            }
        }

        return props;

    }


    /**
     * 获取字符型属性（默认值为空字符串）
     * @param props
     * @param key
     * @return
     */
    public static String getString(Properties props,String key){

        return getString(props,key,"");

    }

    /**
     * 获取字符型属性（可制定默认值）
     */
    public static String getString(Properties props,String key,String defaultValue){

        String value = defaultValue;

        if(props.containsKey(key))
            value = props.getProperty(key);

        return value;
    }

    /**
     * 获取数值型属性（默认值为0）
     */
    public static int getInt(Properties props,String key){
        return getInt(props,key,0);
    }

    /**
     * 获取数值型属性（可指定默认值）
     * @param props
     * @param key
     * @param defaultValue
     * @return
     */
    public static int getInt(Properties props,String key,int defaultValue){

        int value = defaultValue;

        if(props.containsKey(key))
            value = CastUtil.castInt(props.getProperty(key));

        return value;
    }

    /**
     * 获取布尔型属性（默认值为false）
     */
    public static boolean getBoolean(Properties props,String key){
        return getBoolean(props,key,false);
    }

    /**
     * 获取布尔属性（可指定默认值）
     */
    public static boolean getBoolean(Properties props,String key,Boolean defaultValue){

        boolean value = defaultValue;

        if(props.containsKey(key)){
            value = CastUtil.castBoolean(props.getProperty(key));
        }

        return value;
    }

}
